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Fig. 1.


Comparison of sensitivity for a number of completed and ongoing wide-area radio surveys. The diameters of the grey circles are proportional to the survey resolution as shown in the bottom left corner. Data presented in this paper are labelled as ‘LoLSS-pre’, whilst the final LoLSS survey is labelled as ‘LoLSS’. For sources with a very steep spectral index (α ≲ −2.3), LoLSS will be the most sensitive survey on the market. References: 8C (Rees 1990); GLEAM (GaLactic and Extragalactic All-sky Murchison Widefield Array survey; Hurley-Walker et al. 2017); TGSS ADR1 (TIFR GMRT Sky Survey – Alternative Data Release 1; Intema et al. 2017); VLSSr (VLA Low-frequency Sky Survey redux; Lane et al. 2014); FIRST (Faint Images of the Radio Sky at Twenty Centimetres; Becker et al. 1995); NVSS (1.4 GHz NRAO VLA Sky Survey; Condon et al. 1998); WENSS (The Westerbork Northern Sky Survey; Rengelink et al. 1997); SUMSS (Sydney University Molonglo Sky Survey; Bock et al. 1999); Apertif (Adams et al. in prep.); EMU (Evolutionary Map of the Universe Norris et al. 2011); VLASS (VLA Sky Survey; Lacy et al. 2020); LoTSS (LOFAR Two-metre Sky Survey; Shimwell et al. 2017).

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